[vala/staging] pango: Update from 1.45.4+

[Rico Tzschichholz <ricotz src gnome org>]

commit 22dfb1cfce359b3ab3b7c312585c6589e3b77969
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue Aug 4 15:26:27 2020 +0200

    pango: Update from 1.45.4+

 vapi/pango.vapi | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/vapi/pango.vapi b/vapi/pango.vapi
index e7ae38f81..e4148cf14 100644
--- a/vapi/pango.vapi
+++ b/vapi/pango.vapi
@@ -677,6 +677,8 @@ namespace Pango {
                public Pango.Color? copy ();
                public void free ();
                public bool parse (string spec);
+               [Version (since = "1.46")]
+               public bool parse_with_alpha (out uint16 alpha, string spec);
                [Version (since = "1.16")]
                public string to_string ();
        }